Render in Real Time? Fasten Render Times?
it depends of your gpu/workstation, gtx 1060 doesn't handle 4k well, you should try to reduce render samples , you should take a look to this tutorial made by Blender guru, aimed to get a smaller render time: click here , by the way if you want something closer to real time rendering, you can reduce samples in preview mode, then you could use rendered mode in blender

you could try:

rendered: 128

preview: 32 or 64  

but be careful of it, the less samples, less quality you'll have
but you will have more shorter render times





here is another tutorial to achieve similar "real time rendering" workflow  like evee engine used in last version of blender, but instead, in the oldest versions without the brand new real time rendering engine "evee" ,

hope this can be useful for you, cheers